To be fair, Fairfax County is one of the highest COL places in the US, 50% more than average. The median home price is $650k. So it's not completely unreasonable that they need to raise the salary of the position to match the area.

Note: I don't live there, but have relatives who do. We considered moving there, but even making $150k per year we could not afford it. It's very expensive.